How to retrieve code of exception using Exception class in PHP when error occured?

Question

I am trying to execute the following but he does not execute me well. Which will be able to be the problem?

$sql = "insert into scele (codigo, nombre) values (?, ?)";
$param = "1, Test1";

$tr = ibase_trans(IBASE_WRITE,$this->cn);
$qr = ibase_prepare($tr,$param);
$this->rs = ibase_execute($sql,$param);
if ($this->rs){
 //Evaluate this condition, but he does not enter here 
}

Answer 1

In PHP 4 error handling in functions and methods was returned by the return command. Let´s say we would like to connect to a database via MySQLi inside a method or function. If the connection fails an error message and the error code should be displayed. In PHP 4 the error handling would have looked like this:

function connect_to_mysql()
{
$mysqli = @new mysqli('localhost', 'username', 'password', 'db_name');
if ($mysqli->connect_errno)
{
return false;}
return true;}

for more Information:http://www.lingulo.com/tutorials/php/error-handling-with-exceptions-in-php-5